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The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly referred to as a Robertson because it has practically identical drive dimensions and the same colour identification system, but the contemporary square drive socket has parallel sides rather than tapered.
Adhesives may be broadly divided in two classes: structural and pressure-sensitive. To form a permanent bond, structural adhesives harden via processes such as evaporation of solvent (for example, white glue), reaction with UV radiation (as in dental adhesives), chemical reaction (such as two part epoxy), or cooling (as in hot melt).
Verlag modern industry, Ralf Heinzmann, 2001, ISBN 3-478-93265-3. BOND it - reference work on bonding technology. DELO Industrial Adhesives, 2018. DVS-3310 quality requirements in adhesive technology. DVS Media, February 2012. (Directive) DIN 6701 Gluing of rail vehicles and vehicle parts. Beuth-Verlag, Berlin, 2007. (standard)
The adhesive is applied to either one or both of the materials being bonded. The pieces are aligned and pressure is added to aid in adhesion and rid the bond of air bubbles. Common ways of applying an adhesive include brushes, rollers, using films or pellets, spray guns and applicator guns (e.g., caulk gun). All of these can be used manually or ...
Skin friction arises from the interaction between the fluid and the skin of the body, and is directly related to the area of the surface of the body that is in contact with the fluid. Skin friction follows the drag equation and rises with the square of the velocity. Skin friction is caused by viscous drag in the boundary layer around the object ...
The field of a rug may also be broken up into different rectangular, square, diamond or lozenge shaped compartments, which in turn can be arranged in rows, or diagonally. [ 65 ] In Persian rugs, the medallion represents the primary pattern, and the infinite repeat of the field appears subordinated, creating an impression of the medallion ...